JUKI MB-373 Manual page 15

Adjustment Procedures
™ Loosen nut 1 of the screw of the needle driving pulley
pressure applying lever and adjust by screwing in and out
screw 2.
The clearance will become larger by screwing it in.
At the time of stop-motion position
0.2 to 0.3 mm
™ Perform adjustment by loosening screw 2 of the nipper bar
block (rear) and moving nipper bar block (rear) 3 to the right
or left.
1
3
Large
Small
2
A
B
2
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Results of Improper Adjustment
™ If the clearance is too large, the
clutch will slip causing starting
difficulty.
If the clearance is too small, the
starting pedal will become heavy.
1
™ If the amount of movement of the
nipper bar block (rear) is too large,
at the beginning of stitching, the
thread will come out of the upper
side of the fabric. Or, the thread will
remain on the wrong side of the
fabric at second stitching.
If its amount is too small, the thread
will slip off or come out of the upper
side of the fabric at second stitching.
Also, if its amount is too large,
thread pull-off lever 1 will come in
contact with thread guide pole 4
where the thread will break.
™ If the end of thread is drawn from
the arrow hole A in the button after
sewing, move nipper bar block
(rear) 3 to the left. And, move it to
the right when the thread end
comes out from the arrow hole B
so that the end of thread should not
come out.
15
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